4. jogging d. sometimes, only when I feel like it 5. occasionally e. not regular—sometimes yes, then no... 6. brisk f. not regular, very few times, but not never 7. leisur...
4. 有时可用It might be ...that ...,和It must have been...that...的句型表示强调。 e.g. (1)It might be his father that you are looking for. (2)It must have been his brother that you met. 5. 强调not...until结构中由until引导的短语(或从句)表示时间状语的...
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